Question about 2000 Jeep Grand Cherokee

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Eratic idle on a jeep grand cherokee 4.0 engine

The rpm goes between 900 and up to 1200 at idle. No engine light no codes on scan tool. Fuel mileage down to 10 or 11 milles per gallon according to message center.

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  • ltmlinestrip Nov 25, 2008

    TPS sensor is good. checked all sensors except camshaft and crankshaft sensors. all checked out good. Also checked for vaccum leak didnt find any. cant hear any hissing sounds.



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Look under hood, check for o hissing sound(means you have foung a vaccum leak. take a small propane torch/without lighting torch open valve and sweep along base of intake manifold when idle smoothes out you've found leak.

Posted on Nov 25, 2008

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My first choice is a throttle position sensor will check my books for the best check proceedure and get back to ya!

Posted on Nov 25, 2008

  • Allen Neal
    Allen Neal Nov 25, 2008

    here is a check list for you to follow from least expensive to most expensive.#1 vacuum leakage ck bolts in intake and throttle body for tightness & missing ,#2 check all vacuum hoses make sure connected and in good condition use a length of fuel hose against your ear to listen for leaks or soapy water w/eng running ,#3clogged air filter,#4clogged pvc valve#5clogged ccv hose ,fuel pump not del proper presure **,these models are known to crack intake mantafolds check for cracks in intake



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While driving my jeep seems to be shifting gears the rpms rev up and then goes back down almost as if surging I changed speed sensor as a guess so far but did not work?

old 1995
we need vastly more symptoms then that,sorry
if the engine surges, that is first. (surges in 1 gear)
but if a transmission down shifts that is normal, rpm rises
(after all its a lower gear) (higher numeric ratio)
find any machanic in town
ask him test drive it.!
10 min.later he wilt tell you
its trans issues.
or its engine, super easy this is driving.

seems you can not, and learning is 1hour in car class..or 10x that lacking facts of drive train functions.

stop guessing. why spend cash on a useless sensor now.
spend cash on $1 shop diagnosis and WIN.
i promise !

or get it scanned.
and post all those DTC errors. P0700? and more.

Jan 24, 2016 | 1995 Jeep Grand Cherokee

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I have an 01 jeep grand cherokee, I was driving home and it fell flat on it face then picked right back up. Went on and then the tack meter went to 0 then it died.

If equipped with a 4lt engine I would suspect a crank sensor or ignition coil issue to cause this problem especially with higher mileage. You may also have a fuel delivery problem ( fuel pump ) causing this issue. Is the check engine light on? If so have the codes scanned for any crank senor problems. The crank sensor and or ignition are problamatic on these engines with high mileage

Jun 08, 2015 | 2001 Jeep Grand Cherokee

1 Answer

2001 jeep grand Cherokee idles rough,misses and backfires

If the "Check Engine" light is on, have someone get the OBDII codes with an OBDII scan tool. If not, check the plugs, distributor, plug wires, timing chain, and compression.

Aug 01, 2014 | 2001 Jeep Grand Cherokee

1 Answer

It turns off and shakes at the stop light

which engine, ??? we can not guess this. ever. nor help well.

6 engines used. world wide. just a tiny clue here, size matters.

stalls at stop lights.
1: needs a tune up? spark plugs?
2: if rpm is lower than 800 RPM hot, (A/c off) then the idle controls are failing. that is caused by many things, ask.

Is the CEL lamp glowing running, I bet it is, and if it is, that means
SCAN IT. Scan it and see the errors. DTC errors.
anyone can rent a scan tool, or get help, scanning it.

if car has an EGR valve, it can stick open and stall at every traffic light. so can sticking ISC motor (idle speed controller)
many jeep engine have no EGR, its done with fancy cam timing.
i cant speak for all 6 engines at once, so do post engine, size.
or its all just guessing....
more guesses. too high fuel pressure.
leaking injectors
dead clogged injectors.
ECT stuck at -40F
thermostat (coolant) stuck open. flooding, and fouling sparks plugs.
and 25 more. ask.
or scan it. and tell engine size.

Apr 17, 2014 | 1999 Jeep Grand Cherokee

1 Answer

2004 jeep cherokee overland when shifting from park to drive loud noise and idle is running rough

find noise location first. never ignore noise on machines. and 10x that on man movers. 100x that in the air.

then scan it. using any obd2 scan tool,
a tool that does Jeep factory codes. 10x that.

Apr 06, 2014 | 2004 Jeep Grand Cherokee

1 Answer

Drive rough with foot on gas

if that is engine related, we dont know here , we cant drive it and feel it.
if that was engine vibration, its most likely MISFIRE.
the #1 cause of MISFIRE, is not doing the 60k mile tune up.

is the CHECK engine lamp off driving? if not scan the ECU/PCM
any scan tool works. (new types) even a $9 tool.
scan it for P03xx codes, misfire.

rough hot or cold engine.
rough only driving and not at idle and not racing RPM parked?
does engine ever stall>?

Dec 12, 2013 | 2004 Jeep Grand Cherokee

1 Answer

Tickover eratic

hot engine,or cold, or both? or does it even get to normal temperature? (scan it)
this is called misfire.
if idle rpm is way too low, its normal, "bad normal."
if idle is low fix that, first.
normal is 800 rpm.
ever do the 60k mile tune up? if not, bingo.

Dec 06, 2013 | 2004 Jeep Grand Cherokee

1 Answer

Code 463 fuel level sensory high imput, what is this and where is it located

Not sure if this helps or not, but here is information from the 1998 Jeep Grand Cherokee Service Manual, ezg_25.pdf, page 6 of 20…

Hex Code = 95
Generic Scan Tool Code = P0462
DRB Scan Tool Display = Fuel Level Sending Unit Volts Too Low
Description of Diagnostic Trouble Code = Open circuit between PCM and fuel gauge sending unit.

Hex Code = 96
Generic Scan Tool Code = P0463
DRB Scan Tool Display = Fuel Level Sending Unit Volts Too High
Description of Diagnostic Trouble Code = Circuit shorted to voltage between PCM and fuel gauge sending unit.

Hex Code = 97
Generic Scan Tool Code = P0460
DRB Scan Tool Display = Fuel Level Unit No Change Over Miles
Description of Diagnostic Trouble Code = No movement of fuel level sender detected.

for additional information on troubleshooting and resolution:

Mar 01, 2010 | 1998 Jeep Grand Cherokee

1 Answer

Check Engine Light

Your diagnostic about this CODE is:

Generic P-Code DRB Scan Tool Display Brief Description of DTC
P0171 (M) 1/1 Fuel System Lean A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
P0320 (M) No Crank Reference Signal at PCM No reference signal (crankshaft position sensor) detected during engine cranking. P0320 (M) No RPM Signal to PCM (Crankshaft Position Sensor Signal to JTEC) A CKP signal has not been detected at th
For more details, you can visit the obd_dtc_jeep

Good luck, and rated this help.

Aug 11, 2009 | 1997 Jeep Grand Cherokee

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